No, it is a sentence. There is no preposition among those four words.
grocer
sells food
Could be Grocer, a dealer in foodstuffs and household supplies
A grocer, or greengrocer.
a green grocer
A person who sells food and small household goods
a grocer is one who buys goods in bulk and then sells them.so we can buy almost all daily need products ranging from tea,coffee to dals,spices.
grocer or purveyorA greengrocer or fruiterer.
UK : Greengrocer - US : Grocer
Starbucks sells the most coffee. They are the largest coffee company in the world.
obviously.it sells coffee
A person that runs a business that sells food is considered to be a grocer. The definition varies between countries and can also include selling more than food items.